commit ab6d7ee29d95ecee28190644f8d001b08d480b34
author 开恒 <kaihuan.pkh@alibaba-inc.com> Fri Jul 12 17:26:52 2019 +0800
committer Paolo Bonzini <bonzini@gnu.org> Fri Jul 12 15:57:36 2019 +0200
tree b14b2fab499b5312669081a8c65048d1919de408
parent 295dd902155035151caae3e4db3f41c8deebba34

bug fix for setup_idt

the setup_idt() has not configured default ISR for all interrupt.

CPU lookup IVT and set 0x0:0x0 (cs:ip) as interrupt handler entry
when received an unexpected interrupt which not setup ISR via
set_realmode_int in setup_idt().

howerver, the 0x0:0x0 point to IVT-self and executing it caused
invalid opcode exception, which the interrupt vector is 6, and the
handler bios_intfake not fixing this problem, this makes CPU run
into a infinite loop.